CERE @ DTU Compute - Scientific Talks

On Wednesday December 12, 2018 we have the following presentations in relation to the same day's PhD defense of Tobias Kasper Skovborg Ritschel. Everybody is welcome.
Location: Building 303A, Auditorium 049

10:00-10:45
Model Predictive Control with Physics-Based Models for Drilling, by John Hedengren, Brigham Young University
Abstract: The drilling industry faces challenging market conditions that motivate the use of automation to reduce costs and decrease well manufacturing variability. The objective of this presentation is to motivate automation initiatives that utilize physics-based models for predictive monitoring and control. This presentation explores current progress, challenges, and opportunities to control critical drilling conditions such as downhole pressure in Managed Pressure Drilling (MPD). The 3 essential elements of automation are explored with a perspective on recent advancements in automation due to downhole measurement availability through wired drillpipe. However, only a small fraction of drilling systems currently utilize wired drillpipe. In automated rig systems, there is additional potential to unlock the predictive capabilities of physics-based models to "see" into the near future to optimize and coordinate control actions. A convergence of several key technologies creates an opportunity to use sophisticated mathematical models within automation. A significant challenge is the size of the physics-based models that have too many adjustable parameters or are too slow in simulation to extract actionable information. This presentation shows how fit-for-purpose models can be used directly in the automation solutions. These fit-for-purpose models have unlocked new ways to think about automation in drilling. For example, rate optimization and pressure control have traditionally been separate applications in MPD. Simulation studies suggest significant potential improvement when combining the two applications.

10:45-11:30
Various Formulations of Phase Equilibrium of Multicomponent Mixtures for Compositional Reservoir Simulation, by Jiri Mikyska, Czech Technical University in Prague
Abstract: In this talk, I am going to present formulations of phase equilibrium of multicomponent mixtures and the way they can be used in the compositional reservoir simulation. The classical formulations of compositional models use pressure, temperature, and overall mixture composition as specification variables (the so-called PTN formulation). Consequently, in compositional modeling the pressure has to be determined before the flash calculation takes place. Possible approaches to this problem are those by Acs et al or by Young and Stevenson. Alternatively, pressure can be determined directly as a part of the flash equilibrium calculation at specified volume, temperature and moles (the so-called VTN formulation). I will discuss our experience gained with such an approach. I will also mention the UVN flash problem (with specified internal energy, volume, and moles) and show how these flash formulations can be described using a unified formulation. Finally, I will discuss applicability of this unified approach in compositional simulation of isothermal and non-isothermal problems.

13:00-14:00
Nonlinear Model Predictive Control for Oil Reservoirs, Tobias Kasper Skovborg Ritschel, Technical University of Denmark

Tidspunkt

ons 12 dec 18
10:00 - 14:00

Arrangør

DTU Compute

Hvor

DTU, Building 303A, Auditorium 049